Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Nomeie as tentativas contra quando as tentativas a favor forem 30.
 ###Tabelas: CREATE TABLE population_area_and_density_sortable_on_each_field (population_area_and_density_sortable_on_each_field_id AUTO_INCREMENT PRIMARY KEY, Province VARCHAR, Population (2004 estimate) INT, Area (km²) INT, Density VARCHAR, GDP (2003, PPS in mil. € ) INT, GDP per cap. (2003, in €) INT) CREATE TABLE 2004-05_table (2004-05_table_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Played VARCHAR, Drawn VARCHAR, Lost VARCHAR, Points for VARCHAR, Points against VARCHAR, Points difference VARCHAR, Points VARCHAR) CREATE TABLE league_table (league_table_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Played VARCHAR, Won VARCHAR, Drawn VARCHAR, Lost VARCHAR, Points for VARCHAR, Points against VARCHAR, Tries for VARCHAR, Tries against VARCHAR, Try bonus VARCHAR, Losing bonus VARCHAR, Points VARCHAR) CREATE TABLE team_seedings (team_seedings_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Team VARCHAR, Total Points INT, 2008-09 Points INT, 2007-08 Points INT, 2006-07 Points INT, 2005-06 Points INT) CREATE TABLE notation (notation_id AUTO_INCREMENT PRIMARY KEY, Fraction VARCHAR, Ellipsis VARCHAR, Vinculum VARCHAR, Dots VARCHAR, Parentheses VARCHAR)  
SELECT Tries against FROM league_table WHERE Tries for = 30